We measure the B0 lifetime and flavor-oscillation frequency using B0→D(*)−π+ decays collected by the Belle II experiment in asymmetric-energy e+e− collisions produced by the SuperKEKB collider operating at the Υ(4S) resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other B meson in the event. The results, based on 33000 signal decays reconstructed in a data sample corresponding to 190  fb−1, are τB0=(1.499±0.013±0.008)  ps, Δmd=(0.516±0.008±0.005)  ps−1, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.

Measurement of the B0 lifetime and flavor-oscillation frequency using hadronic decays reconstructed in 2019–2021 Belle II data

Gabrielli, A.;Ganiev, E.;Ghosh, D.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2023-01-01

Abstract

We measure the B0 lifetime and flavor-oscillation frequency using B0→D(*)−π+ decays collected by the Belle II experiment in asymmetric-energy e+e− collisions produced by the SuperKEKB collider operating at the Υ(4S) resonance. We fit the decay-time distribution of signal decays, where the initial flavor is determined by identifying the flavor of the other B meson in the event. The results, based on 33000 signal decays reconstructed in a data sample corresponding to 190  fb−1, are τB0=(1.499±0.013±0.008)  ps, Δmd=(0.516±0.008±0.005)  ps−1, where the first uncertainties are statistical and the second are systematic. These results are consistent with the world-average values.
2023
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https://journals.aps.org/prd/abstract/10.1103/PhysRevD.107.L091102
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3068806
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